Data flow diagram problem

Complete a decomposed lower level data flow diagram (DFD) for the following requirements for a customer posting payment to a store charge account. This is done by scratch using Microsoft Visio and based on the Gane and Sarson shapes The customer will send payment by mail and the payment will be posted through the system that updates the customer charge account.The payments have to be deposited systematically to the bank, recorded in the general ledger by the system, and the system should automatically send the customer a receipt.Your DFD should have two external entities, two data stores, and three processes.You should utilize Microsoft Visio to create this DFD.